Reflector-shade.



R. 13., BENJAMIN. REFLECTOR SHADE.

APPLICATION FILED AUG. 23, 1910.

Patented July M, @914.

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a reflector that the light ,s ed by REUBEN 13.3KB, d1? CHICAGO,

MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A

trainers, nssranoa ro amateurs annc'rarc 3.ATION or rumors.

anemones-arisen.

catamaran or team Patent.

Patented daily at, 119%.

Application filled August 23, will. fiertal Ito. b'wdtll;

the tollowing is a full, clear, concise,'and

exact description, reference being had to the accompanying drawing, forming a part ot this specification.

My invention pertains to reflector shades and particularly to such reflector shades as are used for street lighting.

It is the object of my invention to provide sde which will distri ute to the the advantage the light shed by the lamp with which it is used.

In the lightin of streets by means of lamps hung in t e center of the road it s desirable o reject the light as far torward and bac ward along the road as is possible but it is unnecessary to proyect the light to a greater distance sidewise than 18 scient to li ht the sidewalks. In order each lamp may be distributed to the greatest advantage, sirable, therefore, cinsiderahly greater distance frontward and backward along the wise. In the lighting of the two streets by means of a lamp the center of the ject the light as far as possible down each road but 1t is unnecery to pro ect it to any very great distance toward the street corners, a sidewalks at I the corners being sudicient. With the above conditions in view I have devised a reflector shade by means of which the light shed by the lamp in connection with which it is used is distributed to greater advantage than has hitherto been possible.

in order that my invention maybe full understood l have shown a reflector sha e intersection of laced in -eonstrncted in accordance therewith, in the accompanying drawings; in which:

l igure l "is a perspective view of the shade secured to a lamp socket and having'a lamp in place therein 7.. Fig. 2 is a plan; and Fig. 3 is a partly sectional elevation of the shade. The form oft shade which I have shown ,zln; the drawings is ot a kind adapted for use in the lighting at anintersection of two streets, the shade being attached to a lamp it is dethat it be projected to a.

roadway than sideclined downwardly and outwardl road, it is desirab e to pro-L distance sucient to light the point of the socket hung in the middle of the roadway. The shade shown in the drawings is constriicted of sheet metal suitably enameled, and consistsof a frusto-conical ortion 10 which incloses the upper part 0 the lamp and is rovided'with an inwardly extending flangey means of which it may be secured to the lower part of the lamp socket, the latter being indicated as 12 in Fig. 1 of the drawings. The metal of the shade is bent to form four radially extending reflectors,

the upper portions 13 of which are in the form of truncated hollow semi-paraboloids, while the lower portions 13 are in the form of walls extending downwardly and outwardly from the ed es of the paraboloidal portions 13. The re ectors are symmetrical and a description of one. of them, therefore, will sudice. Une or" the refiectors is shown in section at the ri ht hand side of Fig. 3, the'axis of the para oloidal portion 13 thereof beingindicated as A B. The parabolic longitudinal curve of the ortion 13 is indicated as B C. It will be seen -that the portion 13 is 50 disposed that its axis A B asses through the axis of the shade and will therefore pass through the filament ot a lamp carried in the socket 12. The portion 18 is so disposed that the axis A B is inpasscs through the filament at a point ad' acent the center thereof, the focus F of the paraholoid being situated in the line of the filament, preferably adjacent the center of the latter. The walls 13 extending downwardly and slightly outwardly from the lower edges of the portions 13 are bent horizontally in parabolic curves; they serve to project outwardly the light emanating from the part of the filament below the focal araboloidal portions '13. These downwardly extending walls 13 are of some importance owing to the length or filament usually used in incandescent lamps. Lamps of this character project much more light in a horizontal The dat portions 13 at the reflectors are cut ad in a plane formin an extremely flat cone, the adyacent edges eing connected by fiat ortions it, whlch portions therefore also orm parts etc flat cone.

in use, the reflector shade is so arranged upon the socket that the reflectors will point up and down theroads at the intersections. By this'mcans light will be cast a considerand plane than vertically.

able distance up and down the roads, but only enough light will be projected outward between the reflectors'l3 to light the sidewalks at the corners of the streets, such light is done by the-ordinary fiat shade, the light wasted being reduced to a minimum.

What I claim as new, and desire to secure by Letters Patent, is:

A reflector shade comprising a plurality of radially extending portions curved substantially into the form of partial paraboloids, the axes of which are inclined slightly downward, walls "extending downwardly from, said portions and curved into the form of parabolas, and a plurality of portions disposed between said curved portions, and forming parts of a flat conical reflector.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

REUBEN B. BENJAMIN. Witnesses:

CHARLES G. Cora, E. R. KING. 

